CN104511368A - Low-grade magnesite purifying process - Google Patents
Low-grade magnesite purifying process Download PDFInfo
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- CN104511368A CN104511368A CN201310443466.4A CN201310443466A CN104511368A CN 104511368 A CN104511368 A CN 104511368A CN 201310443466 A CN201310443466 A CN 201310443466A CN 104511368 A CN104511368 A CN 104511368A
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- grade magnesite
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
Abstract
The invention relates to a magnesite purifying process, in particular to a low-grade magnesite purifying process. The processes of ore grinding, reverse flotation desiliconization, low-temperature roasting, air classification, hydration and high-temperature calcination are performed for a low-grade magnesite, so that the content of magnesium oxide in the product is higher than 98%. The low-grade magnesite purifying process has the following advantages: quartz and silicate in ores are effectively removed through the ore grinding and the reverse flotation; because of the low-temperature roasting, calcium carbonate is not decomposed, and magnesium carbonate is decomposed to the magnesium oxide; the grinding and the classification are performed according to the hardness difference of the roasted product; the magnesium oxide with lower hardness is enriched in fine particles, so that most of the calcium carbonate and iron and aluminum compounds can be removed; calcium oxide is dissolved in water through the hydration; and the magnesium oxide is secondarily purified to finally obtain magnesium hydroxide with higher purity. Finally, high-purity magnesium oxide with the magnesium oxide content higher than 98% and the density higher than 3.4g/cm<3> is obtained through the high-temperature calcination.
Description
Technical field
The present invention relates to a kind of magnesite purifying technique, particularly relate to a kind of low-grade magnesite purifying technique.
Background technology
China's magnesite resource enriches, and the ore quality exploited out is very high, so compare less to the research of magnesite technique of preparing all the time.Cause the excellent ore of a large amount of grade below 46% not to be effectively used, greatly waste resource.Abroad because magnesite ore resource is poor, most magnesite ore complex structure, grade relatively low (being less than 40%), so many to the purification by mineral technical research of magnesite.The magnesite ore in India somewhere contains quartz and the silicate of 14-41.5%, and after ore dressing, quartz and silicate content are reduced to about 3%.Austria's somewhere magnesite Mg0 content is less than 30%, but after ore dressing, its content reaches more than 46.5%, and effect is very remarkable.
At present a large amount of magnesite mine is due to random exploitation, cause adopting richness abandon poor, disorderly adopt and rob a mine.The ore recovery rate in some mine is less than 50%, and quite a few high-quality magnesite mine is seriously damaged, and concerning such developing power of China, resource situation allows of no optimist.By existing recovery method, after 30 years, most of mining area will be adopted extremely.China's magnesite industry especially Liaoning Area is in first-class raw material, second-class processing, third-class product, the state of the price of the fourth class always.Although after reform and opening-up, around market to the needs of refractory material, through tackling of key scientific and technical problems and technology transfer, Liaoning Province of China, Shandong Province establish three magnesite flotation mills, product quality is greatly improved, fill up the blank that China can not produce high-grade magnesia in the past, thus meet the urgent need of China's steel and iron industry to high-grade raw material.But the sintering magnesite current production rate of this high-purity, high volume density and megacryst is limited, still can not satisfy the demand, also not possess competitiveness in international market, the magnesia of the just common grade of outlet, although export volume is very large, value of earning foreign exchange is very low.Therefore change existing situation, the high-purity magnesium oxide that production added value is higher just becomes the key of dealing with problems.
Summary of the invention
In order to solve the problem, the invention provides a kind of low-grade magnesite purifying technique, object makes the content of magnesia in product be greater than 98%, and density is greater than 3.4g/cm
3.
For achieving the above object, the invention provides a kind of low-grade magnesite purifying technique, low-grade magnesite, through ore grinding, Counterfloatating desiliconization, low-temperature bake, air classification, aquation and high-temperature burning process, makes the content of magnesia in product be greater than 98%.
Low-grade magnesite, after fragmentation, feeds the one section of closed circuit grinding system be made up of grinding machine and cyclone, and make-200 order content in cyclone overflow be 70-90%, pulp density remains on 20-30%.
Counterfloatating desiliconization adopts lauryl amine as collecting agent, and consumption is 80-100g/ ton. raw ore; No. two oil are as foaming agent, and consumption is 20-40g/ ton. raw ore; Waterglass is as inhibitor, and consumption is 100-200g/ ton. raw ore; Employing one is thick, the flotation flowsheet of two essences; Concentrate after flotation is through concentrated, filter progress.
Low-temperature bake is that the concentrate after flotation carries out roasting at 550-750 DEG C, and roasting time is 1-2 hour.
Air classification product of roasting is fed the closed circuit circulatory system be made up of grinding machine and air classification, and making final products granularity be-200 order content is more than 90%.
Aquation be by air classification after solid be added to the water, make the liquid-solid ratio of slip be 2:1-3:1, hydration temperature is 60-90 DEG C; Reaction terminates to carry out filtration washing to solid sediment afterwards.
High-temperature calcination filtration product after aquation is carried out drying, after pressure ball, calcines under temperature is 1400-1600 DEG C of condition; Calcining afterproduct cools in a nitrogen environment, and the product obtained is high-purity magnesium oxide.
Advantage of the present invention is: by ore grinding and reverse flotation, the quartz in ore and silicate are removed effectively; By low-temperature bake, calcium carbonate is not decomposed, and magnesium carbonate is decomposed into magnesia; Carry out grinding according to roasting afterproduct difference in hardness difference, classification, the magnesia that hardness is less obtains enrichment in fine grained, can remove most calcium carbonate and iron, aluminium compound like this; Make calcium oxide water-soluble by aquation, secondary purification is carried out to magnesia, finally obtain the magnesium hydroxide that purity is higher.By high-temperature calcination, finally obtain content of magnesia and be greater than 98%, density is greater than 3.4g/cm
3high-purity magnesium oxide.
Accompanying drawing explanation
Fig. 1 is process chart of the present invention.
Detailed description of the invention
below in conjunction with accompanying drawing, the invention will be further described.
Embodiment 1
A kind of low-grade magnesite purifying technique of the present invention as shown in the figure, low-grade magnesite, through ore grinding, Counterfloatating desiliconization, low-temperature bake, air classification, aquation and high-temperature burning process, makes the content of magnesia in product be greater than 98%.
By low-grade magnesite after fragmentation, feed the one section of closed circuit grinding system be made up of grinding machine and cyclone, make-200 order content in cyclone overflow be 70%, pulp density remains on 20%.Adopt lauryl amine as collecting agent, consumption is 80g/ ton. raw ore; No. two oil are as foaming agent, and consumption is 20g/ ton. raw ore; Waterglass is as inhibitor, and consumption is 150g/ ton. raw ore; Employing one is thick, the flotation flowsheet of two essences; Concentrate after flotation is through concentrated, filter progress.Low-temperature bake is that the concentrate after flotation carries out roasting at 550 DEG C, and roasting time is 1 hour.Air classification product of roasting is fed the closed circuit circulatory system be made up of grinding machine and air classification, and making final products granularity be-200 order content is 90%.Aquation be by air classification after solid be added to the water, make the liquid-solid ratio of slip be 2:1, hydration temperature is 60 DEG C; Reaction terminates to carry out filtration washing to solid sediment afterwards.High-temperature calcination filtration product after aquation is carried out drying, after pressure ball, calcines under temperature is 1400 DEG C of conditions; Calcining afterproduct cools in a nitrogen environment, and the product obtained is high-purity magnesium oxide.Result is as shown in table 1:
。
Embodiment 2
A kind of low-grade magnesite purifying technique of the present invention as shown in the figure, low-grade magnesite, through ore grinding, Counterfloatating desiliconization, low-temperature bake, air classification, aquation and high-temperature burning process, makes the content of magnesia in product be greater than 98%.
By low-grade magnesite after fragmentation, feed the one section of closed circuit grinding system be made up of grinding machine and cyclone, make-200 order content in cyclone overflow be 80%, pulp density remains on 25%.Adopt lauryl amine as collecting agent, consumption is 90g/ ton. raw ore; No. two oil are as foaming agent, and consumption is 30g/ ton. raw ore; Waterglass is as inhibitor, and consumption is 120g/ ton. raw ore; Employing one is thick, the flotation flowsheet of two essences; Concentrate after flotation is through concentrated, filter progress.Low-temperature bake is that the concentrate after flotation carries out roasting at 600 DEG C, and roasting time is 1.5 hours.Air classification product of roasting is fed the closed circuit circulatory system be made up of grinding machine and air classification, and making final products granularity be-200 order content is 95%.Aquation be by air classification after solid be added to the water, make the liquid-solid ratio of slip be 2:1, hydration temperature is 70 DEG C; Reaction terminates to carry out filtration washing to solid sediment afterwards.High-temperature calcination filtration product after aquation is carried out drying, after pressure ball, calcines under temperature is 1500 DEG C of conditions; Calcining afterproduct cools in a nitrogen environment, and the product obtained is high-purity magnesium oxide.Its result is as shown in table 2:
。
Embodiment 3
A kind of low-grade magnesite purifying technique of the present invention as shown in the figure, low-grade magnesite, through ore grinding, Counterfloatating desiliconization, low-temperature bake, air classification, aquation and high-temperature burning process, makes the content of magnesia in product be greater than 98%.
By low-grade magnesite after fragmentation, feed the one section of closed circuit grinding system be made up of grinding machine and cyclone, make-200 order content in cyclone overflow be 85%, pulp density remains on 25%.Adopt lauryl amine as collecting agent, consumption is 95g/ ton. raw ore; No. two oil are as foaming agent, and consumption is 35g/ ton. raw ore; Waterglass is as inhibitor, and consumption is 150g/ ton. raw ore; Employing one is thick, the flotation flowsheet of two essences; Concentrate after flotation is through concentrated, filter progress.Low-temperature bake is that the concentrate after flotation carries out roasting at 6000 DEG C, and roasting time is 1.5 hours.Air classification product of roasting is fed the closed circuit circulatory system be made up of grinding machine and air classification, and making final products granularity be-200 order content is 95%.Aquation be by air classification after solid be added to the water, make the liquid-solid ratio of slip be 3:1, hydration temperature is 80 DEG C; Reaction terminates to carry out filtration washing to solid sediment afterwards.High-temperature calcination filtration product after aquation is carried out drying, after pressure ball, calcines under temperature is 1600 DEG C of conditions; Calcining afterproduct cools in a nitrogen environment, and the product obtained is high-purity magnesium oxide.Its result is as shown in table 3:
。
Embodiment 4
A kind of low-grade magnesite purifying technique of the present invention as shown in the figure, low-grade magnesite, through ore grinding, Counterfloatating desiliconization, low-temperature bake, air classification, aquation and high-temperature burning process, makes the content of magnesia in product be greater than 98%.
By low-grade magnesite after fragmentation, feed the one section of closed circuit grinding system be made up of grinding machine and cyclone, make-200 order content in cyclone overflow be 90%, pulp density remains on 30%.Adopt lauryl amine as collecting agent, consumption is 100g/ ton. raw ore; No. two oil are as foaming agent, and consumption is 40g/ ton. raw ore; Waterglass is as inhibitor, and consumption is 200g/ ton. raw ore; Employing one is thick, the flotation flowsheet of two essences; Concentrate after flotation is through concentrated, filter progress.Low-temperature bake is that the concentrate after flotation carries out roasting at 750 DEG C, and roasting time is 2 hours.Air classification product of roasting is fed the closed circuit circulatory system be made up of grinding machine and air classification, and making final products granularity be-200 order content is 98%.Aquation be by air classification after solid be added to the water, make the liquid-solid ratio of slip be 3:1, hydration temperature is 90 DEG C; Reaction terminates to carry out filtration washing to solid sediment afterwards.High-temperature calcination filtration product after aquation is carried out drying, after pressure ball, calcines under temperature is 1600 DEG C of conditions; Calcining afterproduct cools in a nitrogen environment, and the product obtained is high-purity magnesium oxide.Its result is as shown in table 4:
。
Claims (7)
1. a low-grade magnesite purifying technique, is characterized in that low-grade magnesite is through ore grinding, Counterfloatating desiliconization, low-temperature bake, air classification, aquation and high-temperature burning process, makes the content of magnesia in product be greater than 98%.
2. a kind of low-grade magnesite purifying technique according to claim 1, it is characterized in that ore grinding refers to that low-grade magnesite is after fragmentation, feed the one section of closed circuit grinding system be made up of grinding machine and cyclone, make-200 order content in cyclone overflow be 70-90%, pulp density remains on 20-30%.
3. a kind of low-grade magnesite purifying technique according to claim 1, it is characterized in that Counterfloatating desiliconization adopts lauryl amine as collecting agent, consumption is 80-100g/ ton. raw ore; No. two oil are as foaming agent, and consumption is 20-40g/ ton. raw ore; Waterglass is as inhibitor, and consumption is 100-200g/ ton. raw ore; Employing one is thick, the flotation flowsheet of two essences; Concentrate after flotation is through concentrated, filter progress.
4. a kind of low-grade magnesite purifying technique according to claim 1, it is characterized in that low-temperature bake is that concentrate after flotation carries out roasting at 550-750 DEG C, roasting time is 1-2 hour.
5. a kind of low-grade magnesite purifying technique according to claim 1, is characterized in that air classification product of roasting is fed the closed circuit circulatory system be made up of grinding machine and air classification, and making final products granularity be-200 order content is more than 90%.
6. a kind of low-grade magnesite purifying technique according to claim 1, it is characterized in that aquation be by air classification after solid be added to the water, make the liquid-solid ratio of slip be 2:1-3:1, hydration temperature is 60-90 DEG C; Reaction terminates to carry out filtration washing to solid sediment afterwards.
7. a kind of low-grade magnesite purifying technique according to claim 1, is characterized in that high-temperature calcination filtration product after aquation is carried out drying, after pressure ball, calcines under temperature is 1400-1600 DEG C of condition; Calcining afterproduct cools in a nitrogen environment, and the product obtained is high-purity magnesium oxide.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109206024A (en) * | 2018-11-30 | 2019-01-15 | 嘉晨集团有限公司 | A kind of preparation method producing highly-purity magnesite using low-grade magnesite as raw material |
| CN109569891A (en) * | 2018-12-19 | 2019-04-05 | 沈阳有色金属研究院有限公司 | One kind is for compound flotation collector of magnesite Counterfloatating desiliconization and preparation method thereof |
| CN110639687A (en) * | 2019-10-21 | 2020-01-03 | 辽宁科技大学 | Thermal separation process of low-grade hydromagnesite ore |
| WO2020199232A1 (en) * | 2019-03-29 | 2020-10-08 | 东北大学 | Method for preparing high-purity light-burned magnesia from low-grade magnesite by calcination to remove calcium and silicon |
| CN112028093A (en) * | 2020-07-13 | 2020-12-04 | 辽宁东和新材料股份有限公司 | Preparation method of high-activity high-purity magnesium oxide |
| CN112551921A (en) * | 2020-11-25 | 2021-03-26 | 海城远东矿业有限公司 | Carbonization activation beneficiation technology for high-silicon magnesite |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109206024A (en) * | 2018-11-30 | 2019-01-15 | 嘉晨集团有限公司 | A kind of preparation method producing highly-purity magnesite using low-grade magnesite as raw material |
| CN109569891A (en) * | 2018-12-19 | 2019-04-05 | 沈阳有色金属研究院有限公司 | One kind is for compound flotation collector of magnesite Counterfloatating desiliconization and preparation method thereof |
| WO2020199232A1 (en) * | 2019-03-29 | 2020-10-08 | 东北大学 | Method for preparing high-purity light-burned magnesia from low-grade magnesite by calcination to remove calcium and silicon |
| CN110639687A (en) * | 2019-10-21 | 2020-01-03 | 辽宁科技大学 | Thermal separation process of low-grade hydromagnesite ore |
| CN110639687B (en) * | 2019-10-21 | 2021-08-03 | 辽宁科技大学 | Thermal separation process of low-grade hydromagnesite ore |
| CN112028093A (en) * | 2020-07-13 | 2020-12-04 | 辽宁东和新材料股份有限公司 | Preparation method of high-activity high-purity magnesium oxide |
| CN112551921A (en) * | 2020-11-25 | 2021-03-26 | 海城远东矿业有限公司 | Carbonization activation beneficiation technology for high-silicon magnesite |
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